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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Turns over, no start, no spark, no dtc’s

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1 year 3 months ago #66376 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
Ok. I am more leaning towards a bad coil than a bad ecu. We'll see when you scope the control wires with you scope.
Assuming is never a good thing.

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1 year 2 months ago #66402 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
Ok, this morning I attached the Uscope to both coil signal inputs. Both of Them read the same thing.  Them read the same thing. 
 

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1 year 2 months ago - 1 year 2 months ago #66403 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
The controls look fine. We just now need to see if the controls are maintained when the vehicle stalls. If they do, we do the same for power and ground. If power and ground are maintained , we put a coil in it.
Assuming is never a good thing.
Last edit: 1 year 2 months ago by Monde.

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1 year 2 months ago #66404 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
I left out a few things. The engine cranked but no start and no spark. Power to coil dropped to 10.8 VDC at start.

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1 year 2 months ago #66405 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
What is the setup to read power and ground.

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1 year 2 months ago #66407 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
The same way you check the signals/controls wires. One lead to ground and the other lead to power and repeat the same for the ground wire.
Assuming is never a good thing.

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1 year 2 months ago #66408 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s

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1 year 2 months ago - 1 year 2 months ago #66409 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
It looks as though you took the measurement on a 5v scale and not a 20v scale.

Are you sure that the coil is OEM? Can you get the shop to return it and get a new one?
Assuming is never a good thing.
Last edit: 1 year 2 months ago by Monde.

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1 year 2 months ago #66411 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
It has Subaru factory marking on the bottom.

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1 year 2 months ago #66412 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
The 10v setting doesn’t show anything. The 5v per graduation works.

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1 year 2 months ago #66416 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
I am not too familiar with Uscope. As long as you don't have any glitches when checking the control wires, power and ground, it may be time for you to try another coil.
Assuming is never a good thing.

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1 year 2 months ago #66444 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
I tried another coil. Cranked but no start, no spark.

I put the OEM coil back on and it started. I wiggled each wire, connector, and harness under the hood, around the ECM, and even the wiring under the dash to see if I could get it to shut down. No luck.

So with this outcome, I ordered a new coil connector. This is the only thing that makes sense.

This same thing happened with the previous coil removal and installations.

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1 year 2 months ago #66447 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
Engine ran fine without any hiccups for 1 hour. Next is a test drive in the neighborhood.

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1 year 2 months ago #66452 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
“ Assuming is never a good thing.” is so appropriate for this job!
I just completed a 10 mile test drive and the Subaru never skipped a beat. I still plan to replace the connector.
Once I replace it I will tear the old one apart and inspect the sockets.

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1 year 2 months ago #66453 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
One note I missed;
I sprayed ACF-50 on the connector and let it sit for 10 minutes, then rinsed it with contact cleaner.

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1 year 2 months ago #66454 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
Keep us updated. We cannot wait to see the car fixed.
Assuming is never a good thing.

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1 year 2 months ago #66552 by Buckeye57
Replied by Buckeye57 on topic Turns over, no start, no spark, no dtc’s
The connector pigtail arrived yesterday and this morning I installed it.

I performed an autopsy on the old connector. Being the no start and not a misfire, the power and ground was what I removed and splayed open . As you can see in the picture, the black ground connection was good, but check out the yellow power. Looks like burn marks on the top and bottom contact surface.

I feel confident that this was the culprit. 

I will run errands today and will keep you posted.

I want to thank you for your help. It is always better with more heads involved.

Tom

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1 year 2 months ago #66563 by Monde
Replied by Monde on topic Turns over, no start, no spark, no dtc’s
Thank you for the update. It looks like the connector was the issue. If the car has been running fine since the last time you posted, I would call that a fix.
Assuming is never a good thing.

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